A portion of the total $6.2 billion investment will be for the expansion of a pipeline that runs from North Dakota's Bakken Oil Fields to Superior

That project, worth $2.5 billion will include the expansion of a twin line dubbed the Sandpiper project, announced last week. It's expected to pipe double the current production of 225,000 barrels of oil per day.

Enbridge officials say the expansion is directly related to the booming oil fields in North Dakota and they need a way to get it to the refineries.

They will have extended access to Chicago area refineries and Detroit, Toledo and Eastern Canada. These projects really connect the producing fields to a number of different refinery markets," said Denise Hamsher, the company's director of project planning.

Other investments include expansions to the mainline system in the US and the Canadian Mainline system.

Enbridge will need to take comments from people living along the proposed route of the pipeline before they can start applying for permits.

Officials say if all goes well, the Sandpiper could be online in 2016.